Question $6(6$ points$)$

Consider the following code, in which we have omitted the expression being computed:

long scale$2($long $\backslash ($ x $\backslash ),$ long $\backslash ($ y $\backslash ),$ long z$)\backslash \{$

long $\backslash (\backslash$mathrm$\{$t$\}=\backslash )$

return t;

$\backslash \}$

Compiling the actual function with ace yields the following assembly code

$```$

x in $\%$rdi $,$ y in $\%$rsi $,$ z in $\%$rdx

scale$2$:

leaq $(\%$rdi,$\%$rdi,$4),\%$rax

leaq $(\%$rax,$\%$rsi,$2),\%$rax

leaq $(\%$rax,$\%$rdx$,8),\%$rax

ret

$```$

Fill in the missing expression $\backslash ($ t $\backslash )$ in the C code.